(1+2平方)乘以(1+2的4次方)乘以(1+2的8次方)乘以.(1+2的64次方)
问题描述:
(1+2平方)乘以(1+2的4次方)乘以(1+2的8次方)乘以.(1+2的64次方)
答
(1+2^2)(1+2^4)(1+2^8)....(1+2^64)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8)....(1+2^64)/(2^2-1)
=(2^4-1)(1+2^4)(1+2^8)....(1+2^64)/3
=(2^8-1)(1+2^8).....(1+2^64)/3
=(2^128-1)/3
答
答:
(1+2^2)(1+2^4)(1+2^8).(1+2^64)
=(2^2-1)(1+2^2)(1+2^4)(1+2^8).(1+2^64)/(2^2-1)
=(2^4-1)(1+2^4)(1+2^8).(1+2^64)/3
=(2^8-1)(1+2^8).(1+2^64)/3
=(2^128-1)/3